Strolling salamanders provide clues on how animals evolved to move from water to land

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Around 390 million years ago, the first vertebrate animals moved fromwater onto land, necessitating changes in their musculoskeletal systems to permit aterrestrial life. Forelimbs and hind limbs of the first tetrapods evolved to support moreweight. But what specific mechanisms drove changes in bone function? The tiger salamander might provide some clues.